sencha touch 2.1 RC1 add to iphone 5 home screen is letterboxed

sencha touch 2.1 RC1 add to iphone 5 home screen is letterboxed

REQUIRED INFORMATION
Ext version tested:

Sencha Touch 2.1 RC1

Browser versions tested against:

iPhone 5 / iOS 6 safari

Description:

When I add the app to homescreen on iPhone 5, the app is letterboxed. I understand that the release note for RC1 says that it is fixed, but not for me. I upgraded to sench touch 2.1 RC1 from beta3, could it be an upgrade issue?